A reconstruction method for cone-beam differential x-ray phase-contrast computed tomography

Jian Fu, Astrid Velroyen, Renbo Tan, Junwei Zhang, Liyuan Chen, Arne Tapfer, Martin Bech, Franz Pfeiffer

Research output: Contribution to journalArticlepeer-review


Most existing differential phase-contrast computed tomography (DPC-CT) approaches are based on three kinds of scanning geometries, described by parallel-beam, fan-beam and cone-beam. Due to the potential of compact imaging systems with magnified spatial resolution, cone-beam DPC-CT has attracted significant interest. In this paper, we report a reconstruction method based on a back-projection filtration (BPF) algorithm for cone-beam DPC-CT. Due to the differential nature of phase contrast projections, the algorithm restrains from differentiation of the projection data prior to back-projection, unlike BPF algorithms commonly used for absorption-based CT data. This work comprises a numerical study of the algorithm and its experimental verification using a dataset measured with a three-grating interferometer and a micro-focus x-ray tube source. Moreover, the numerical simulation and experimental results demonstrate that the proposed method can deal with several classes of truncated cone-beam datasets. We believe that this feature is of particular interest for future medical cone-beam phase-contrast CT imaging applications. (C) 2012 Optical Society of America
Original languageEnglish
Pages (from-to)21512-21519
JournalOptics Express
Issue number19
Publication statusPublished - 2012

Subject classification (UKÄ)

  • Atom and Molecular Physics and Optics


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